SULFONAMIDE-BASED ORGANOCATALYSTS AND METHOD FOR THEIR USE
申请人:Carter Rich Garrett
公开号:US20100184986A1
公开(公告)日:2010-07-22
Organocatalysts, particularly proline sulfonamide organocatalysts, having a first general formula as follows are disclosed.
Embodiments of a method for using these organocatalysts also are disclosed. The method comprises providing a disclosed organocatalyst, and performing a reaction, often an enantioselective or diastereoselective reaction, using the organocatalyst. Solely by way of example, disclosed catalysts can be used to perform aldol reactions, conjugate additions, Michael additions, Robinson annulations, Mannich reactions, α-aminooxylations, α-hydroxyaminations, α-aminations and alkylation reactions. Certain of such reactions are intramolecular cyclizations used to form cyclic compounds, such as 5- or 6-membered rings, having one or more chiral centers. Disclosed organocatalysts generally are much more soluble in typical solvents used for organic synthesis than are known compounds. Moreover, the reaction yield is generally quite good with disclosed compounds, as is their enantioselective and diastereoselective effectiveness.
Development of an Enantioselective Route toward the <i>Lycopodium</i> Alkaloids: Total Synthesis of Lycopodine
作者:Hua Yang、Rich G. Carter
DOI:10.1021/jo100916x
日期:2010.8.6
sequence include organocatalytic, intramolecular Michael addition of a keto sulfone and a tandem 1,3-sulfonyl shift/Mannich cyclization to construct the tricyclic core ring system. Synthetic work toward this natural product family led to the development of N-(p-dodecylphenylsulfonyl)-2-pyrrolidinecarboxamide, an organocatalyst which facilitiates enantioselective, intramolecular Michael additions. A detailed